newlib/winsup/cygwin/fhandler_console.cc

/* fhandler_console.cc

   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   2006, 2008 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#include "winsup.h"
#include "miscfuncs.h"
#include <stdio.h>
#include <stdlib.h>
#include <wingdi.h>
#include <winuser.h>
#include <winnls.h>
#include <ctype.h>
#include <sys/cygwin.h>
#include <cygwin/kd.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#include "pinfo.h"
#include "shared_info.h"
#include "cygtls.h"
#include "tls_pbuf.h"
#include "registry.h"

/* Don't make this bigger than NT_MAX_PATH as long as the temporary buffer
   is allocated using tmp_pathbuf!!! */
#define CONVERT_LIMIT NT_MAX_PATH

/*
 * Scroll the screen context.
 * x1, y1 - ul corner
 * x2, y2 - dr corner
 * xn, yn - new ul corner
 * Negative values represents current screen dimensions
 */

#define srTop (dev_state->info.winTop + dev_state->scroll_region.Top)
#define srBottom ((dev_state->scroll_region.Bottom < 0) ? dev_state->info.winBottom : dev_state->info.winTop + dev_state->scroll_region.Bottom)

#define use_tty ISSTATE (myself, PID_USETTY)

const char * get_nonascii_key (INPUT_RECORD&, char *);

static console_state NO_COPY *shared_console_info;

dev_console NO_COPY *fhandler_console::dev_state;

/* Allocate and initialize the shared record for the current console.
   Returns a pointer to shared_console_info. */
tty_min *
fhandler_console::get_tty_stuff (int flags = 0)
{
  if (dev_state)
    return &shared_console_info->tty_min_state;

  shared_locations sh_shared_console = SH_SHARED_CONSOLE;
  shared_console_info =
    (console_state *) open_shared (NULL, 0, cygheap->console_h,
				   sizeof (*shared_console_info),
				   sh_shared_console);
  dev_state = &shared_console_info->dev_state;

  ProtectHandleINH (cygheap->console_h);
  if (!shared_console_info->tty_min_state.ntty)
    {
      shared_console_info->tty_min_state.setntty (TTY_CONSOLE);
      shared_console_info->tty_min_state.setsid (myself->sid);
      myself->set_ctty (&shared_console_info->tty_min_state, flags, NULL);

      dev_state->scroll_region.Bottom = -1;
      dev_state->dwLastCursorPosition.X = -1;
      dev_state->dwLastCursorPosition.Y = -1;
      dev_state->underline_color = FOREGROUND_GREEN | FOREGROUND_BLUE;
      dev_state->dim_color = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
      dev_state->meta_mask = LEFT_ALT_PRESSED;
      /* Set the mask that determines if an input keystroke is modified by
	 META.  We set this based on the keyboard layout language loaded
	 for the current thread.  The left <ALT> key always generates
	 META, but the right <ALT> key only generates META if we are using
	 an English keyboard because many "international" keyboards
	 replace common shell symbols ('[', '{', etc.) with accented
	 language-specific characters (umlaut, accent grave, etc.).  On
	 these keyboards right <ALT> (called AltGr) is used to produce the
	 shell symbols and should not be interpreted as META. */
      if (PRIMARYLANGID (LOWORD (GetKeyboardLayout (0))) == LANG_ENGLISH)
	dev_state->meta_mask |= RIGHT_ALT_PRESSED;
      dev_state->set_default_attr ();
      shared_console_info->tty_min_state.sethwnd ((HWND) INVALID_HANDLE_VALUE);
    }

  return &shared_console_info->tty_min_state;
}

void
set_console_ctty ()
{
  fhandler_console::get_tty_stuff ();
}

/* Return the tty structure associated with a given tty number.  If the
   tty number is < 0, just return a dummy record. */
tty_min *
tty_list::get_tty (int n)
{
  static tty_min nada;
  if (n == TTY_CONSOLE)
    return fhandler_console::get_tty_stuff ();
  else if (n >= 0)
    return &cygwin_shared->tty.ttys[n];
  else
    return &nada;
}

/* The results of GetConsoleCP() and GetConsoleOutputCP() cannot be
   cached, because a program or the user can change these values at
   any time. */
inline DWORD
dev_console::con_to_str (char *d, int dlen, WCHAR w)
{
  return sys_wcstombs (d, dlen, &w, 1);
}

inline UINT
dev_console::get_console_cp ()
{
  return alternate_charset_active ? GetConsoleOutputCP () : get_cp ();
}

inline DWORD
dev_console::str_to_con (PWCHAR d, const char *s, DWORD sz)
{
  return MultiByteToWideChar (get_console_cp (), 0, s, sz, d, CONVERT_LIMIT);
}

bool
fhandler_console::set_raw_win32_keyboard_mode (bool new_mode)
{
  bool old_mode = dev_state->raw_win32_keyboard_mode;
  dev_state->raw_win32_keyboard_mode = new_mode;
  syscall_printf ("raw keyboard mode %sabled", dev_state->raw_win32_keyboard_mode ? "en" : "dis");
  return old_mode;
};

void
fhandler_console::set_cursor_maybe ()
{
  CONSOLE_SCREEN_BUFFER_INFO now;

  if (!GetConsoleScreenBufferInfo (get_output_handle (), &now))
    return;

  if (dev_state->dwLastCursorPosition.X != now.dwCursorPosition.X ||
      dev_state->dwLastCursorPosition.Y != now.dwCursorPosition.Y)
    {
      SetConsoleCursorPosition (get_output_handle (), now.dwCursorPosition);
      dev_state->dwLastCursorPosition = now.dwCursorPosition;
    }
}

void
fhandler_console::send_winch_maybe ()
{
  SHORT y = dev_state->info.dwWinSize.Y;
  SHORT x = dev_state->info.dwWinSize.X;
  dev_state->fillin_info (get_output_handle ());

  if (y != dev_state->info.dwWinSize.Y || x != dev_state->info.dwWinSize.X)
    {
      extern fhandler_tty_master *tty_master;
      dev_state->scroll_region.Top = 0;
      dev_state->scroll_region.Bottom = -1;
      if (tty_master)
	tty_master->set_winsize (true);
      else
	tc->kill_pgrp (SIGWINCH);
    }
}

void __stdcall
fhandler_console::read (void *pv, size_t& buflen)
{
  HANDLE h = get_io_handle ();

#define buf ((char *) pv)

  int ch;
  set_input_state ();

  int copied_chars = get_readahead_into_buffer (buf, buflen);

  if (copied_chars)
    {
      buflen = copied_chars;
      return;
    }

  HANDLE w4[2];
  DWORD nwait;
  char tmp[60];

  w4[0] = h;
  if (&_my_tls != _main_tls)
    nwait = 1;
  else
    {
      w4[1] = signal_arrived;
      nwait = 2;
    }

  termios ti = tc->ti;
  for (;;)
    {
      int bgres;
      if ((bgres = bg_check (SIGTTIN)) <= bg_eof)
	{
	  buflen = bgres;
	  return;
	}

      set_cursor_maybe ();	/* to make cursor appear on the screen immediately */
      switch (WaitForMultipleObjects (nwait, w4, FALSE, INFINITE))
	{
	case WAIT_OBJECT_0:
	  break;
	case WAIT_OBJECT_0 + 1:
	  goto sig_exit;
	default:
	  goto err;
	}

      DWORD nread;
      INPUT_RECORD input_rec;
      const char *toadd = NULL;

      if (!ReadConsoleInputW (h, &input_rec, 1, &nread))
	{
	  syscall_printf ("ReadConsoleInput failed, %E");
	  goto err;		/* seems to be failure */
	}

      /* check the event that occurred */
      switch (input_rec.EventType)
	{
	case KEY_EVENT:
#define virtual_key_code (input_rec.Event.KeyEvent.wVirtualKeyCode)
#define control_key_state (input_rec.Event.KeyEvent.dwControlKeyState)

	  dev_state->nModifiers = 0;

#ifdef DEBUGGING
	  /* allow manual switching to/from raw mode via ctrl-alt-scrolllock */
	  if (input_rec.Event.KeyEvent.bKeyDown &&
	      virtual_key_code == VK_SCROLL &&
	      control_key_state & (LEFT_ALT_PRESSED | LEFT_CTRL_PRESSED) == LEFT_ALT_PRESSED | LEFT_CTRL_PRESSED
	    )
	    {
	      set_raw_win32_keyboard_mode (!dev_state->raw_win32_keyboard_mode);
	      continue;
	    }
#endif

	  if (dev_state->raw_win32_keyboard_mode)
	    {
	      __small_sprintf (tmp, "\033{%u;%u;%u;%u;%u;%luK",
				    input_rec.Event.KeyEvent.bKeyDown,
				    input_rec.Event.KeyEvent.wRepeatCount,
				    input_rec.Event.KeyEvent.wVirtualKeyCode,
				    input_rec.Event.KeyEvent.wVirtualScanCode,
				    input_rec.Event.KeyEvent.uChar.UnicodeChar,
				    input_rec.Event.KeyEvent.dwControlKeyState);
	      toadd = tmp;
	      nread = strlen (toadd);
	      break;
	    }

#define ich (input_rec.Event.KeyEvent.uChar.AsciiChar)
#define wch (input_rec.Event.KeyEvent.uChar.UnicodeChar)
#define ALT_PRESSED (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)
#define CTRL_PRESSED (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)

	  /* Ignore key up events, except for left alt events with non-zero character
	   */
	  if (!input_rec.Event.KeyEvent.bKeyDown &&
	      /*
		Event for left alt, with a non-zero character, comes from
		"alt + numerics" key sequence.
		e.g. <left-alt> 0233 => &eacute;
	      */
	      !(wch != 0
		// ?? experimentally determined on an XP system
		&& virtual_key_code == VK_MENU
		// left alt -- see http://www.microsoft.com/hwdev/tech/input/Scancode.asp
		&& input_rec.Event.KeyEvent.wVirtualScanCode == 0x38))
	    continue;

	  if (control_key_state & SHIFT_PRESSED)
	    dev_state->nModifiers |= 1;
	  if (control_key_state & RIGHT_ALT_PRESSED)
	    dev_state->nModifiers |= 2;
	  if (control_key_state & CTRL_PRESSED)
	    dev_state->nModifiers |= 4;
	  if (control_key_state & LEFT_ALT_PRESSED)
	    dev_state->nModifiers |= 8;

	  if (wch == 0 ||
	      /* arrow/function keys */
	      (input_rec.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY))
	    {
	      toadd = get_nonascii_key (input_rec, tmp);
	      if (!toadd)
		{
		  dev_state->nModifiers = 0;
		  continue;
		}
	      nread = strlen (toadd);
	    }
	  else
	    {
	      nread = dev_state->con_to_str (tmp + 1, 59, wch);
	      /* Determine if the keystroke is modified by META.  The tricky
		 part is to distinguish whether the right Alt key should be
		 recognized as Alt, or as AltGr. */
	      bool meta;
	      meta = (control_key_state & ALT_PRESSED) != 0
		     && ((control_key_state & CTRL_PRESSED) == 0
			 || (wch <= 0x1f || wch == 0x7f));
	      if (!meta)
		toadd = tmp + 1;
	      else if (dev_state->metabit)
		{
		  tmp[1] |= 0x80;
		  toadd = tmp + 1;
		}
	      else
		{
		  tmp[0] = '\033';
		  tmp[1] = cyg_tolower (tmp[1]);
		  toadd = tmp;
		  nread++;
		  dev_state->nModifiers &= ~4;
		}
	    }
#undef ich
#undef wch
#undef ALT_PRESSED
#undef CTRL_PRESSED
	  break;

	case MOUSE_EVENT:
	  send_winch_maybe ();
	  if (dev_state->use_mouse)
	    {
	      MOUSE_EVENT_RECORD& mouse_event = input_rec.Event.MouseEvent;

	      /* Treat the double-click event like a regular button press */
	      if (mouse_event.dwEventFlags == DOUBLE_CLICK)
		{
		  syscall_printf ("mouse: double-click -> click");
		  mouse_event.dwEventFlags = 0;
		}

	      /* Did something other than a click occur? */
	      if (mouse_event.dwEventFlags)
		continue;

	      /* Retrieve reported mouse position */
	      int x = mouse_event.dwMousePosition.X;
	      int y = mouse_event.dwMousePosition.Y;

	      /* Adjust mouse position by scroll buffer offset */
	      CONSOLE_SCREEN_BUFFER_INFO now;
	      if (GetConsoleScreenBufferInfo (get_output_handle (), &now))
		{
		  y -= now.srWindow.Top;
		  x -= now.srWindow.Left;
		}
	      else
		{
		  syscall_printf ("mouse: cannot adjust position by scroll buffer offset");
		  continue;
		}

	      /* If the mouse event occurred out of the area we can handle,
		 ignore it. */
	      if ((x + ' ' + 1 > 0xFF) || (y + ' ' + 1 > 0xFF))
		{
		  syscall_printf ("mouse: position out of range");
		  continue;
		}

	      /* Ignore unimportant mouse buttons */
	      mouse_event.dwButtonState &= 0x7;

	      /* This code assumes Windows never reports multiple button
		 events at the same time. */
	      int b = 0;
	      char sz[32];
	      if (mouse_event.dwButtonState == dev_state->dwLastButtonState)
		{
		  syscall_printf ("mouse: button state unchanged");
		  continue;
		}
	      else if (mouse_event.dwButtonState < dev_state->dwLastButtonState)
		{
		  b = 3;
		  strcpy (sz, "btn up");
		}
	      else if ((mouse_event.dwButtonState & 1) != (dev_state->dwLastButtonState & 1))
		{
		  b = 0;
		  strcpy (sz, "btn1 down");
		}
	      else if ((mouse_event.dwButtonState & 2) != (dev_state->dwLastButtonState & 2))
		{
		  b = 2;
		  strcpy (sz, "btn2 down");
		}
	      else if ((mouse_event.dwButtonState & 4) != (dev_state->dwLastButtonState & 4))
		{
		  b = 1;
		  strcpy (sz, "btn3 down");
		}

	      /* Remember the current button state */
	      dev_state->dwLastButtonState = mouse_event.dwButtonState;

	      /* If a button was pressed, remember the modifiers */
	      if (b != 3)
		{
		  dev_state->nModifiers = 0;
		  if (mouse_event.dwControlKeyState & SHIFT_PRESSED)
		    dev_state->nModifiers |= 0x4;
		  if (mouse_event.dwControlKeyState & (RIGHT_ALT_PRESSED|LEFT_ALT_PRESSED))
		    dev_state->nModifiers |= 0x8;
		  if (mouse_event.dwControlKeyState & (RIGHT_CTRL_PRESSED|LEFT_CTRL_PRESSED))
		    dev_state->nModifiers |= 0x10;
		}

	      b |= dev_state->nModifiers;

	      /* We can now create the code. */
	      sprintf (tmp, "\033[M%c%c%c", b + ' ', x + ' ' + 1, y + ' ' + 1);
	      syscall_printf ("mouse: %s at (%d,%d)", sz, x, y);

	      toadd = tmp;
	      nread = 6;
	    }
	  break;

	case FOCUS_EVENT:
	case WINDOW_BUFFER_SIZE_EVENT:
	  send_winch_maybe ();
	  /* fall through */
	default:
	  continue;
	}

      if (toadd)
	{
	  line_edit_status res = line_edit (toadd, nread, ti);
	  if (res == line_edit_signalled)
	    goto sig_exit;
	  else if (res == line_edit_input_done)
	    break;
	}
    }

  while (buflen)
    if ((ch = get_readahead ()) < 0)
      break;
    else
      {
	buf[copied_chars++] = (unsigned char)(ch & 0xff);
	buflen--;
      }
#undef buf

  buflen = copied_chars;
  return;

err:
  __seterrno ();
  buflen = (size_t) -1;
  return;

sig_exit:
  set_sig_errno (EINTR);
  buflen = (size_t) -1;
}

void
fhandler_console::set_input_state ()
{
  if (tc->rstcons ())
    input_tcsetattr (0, &tc->ti);
}

bool
dev_console::fillin_info (HANDLE h)
{
  bool ret;
  CONSOLE_SCREEN_BUFFER_INFO linfo;

  if ((ret = GetConsoleScreenBufferInfo (h, &linfo)))
    {
      info.winTop = linfo.srWindow.Top;
      info.winBottom = linfo.srWindow.Bottom;
      info.dwWinSize.Y = 1 + linfo.srWindow.Bottom - linfo.srWindow.Top;
      info.dwWinSize.X = 1 + linfo.srWindow.Right - linfo.srWindow.Left;
      info.dwBufferSize = linfo.dwSize;
      info.dwCursorPosition = linfo.dwCursorPosition;
      info.wAttributes = linfo.wAttributes;
    }
  else
    {
      memset (&info, 0, sizeof info);
      info.dwWinSize.Y = 25;
      info.dwWinSize.X = 80;
      info.winBottom = 24;
    }

  return ret;
}

void
fhandler_console::scroll_screen (int x1, int y1, int x2, int y2, int xn, int yn)
{
  SMALL_RECT sr1, sr2;
  CHAR_INFO fill;
  COORD dest;

  dev_state->fillin_info (get_output_handle ());
  sr1.Left = x1 >= 0 ? x1 : dev_state->info.dwWinSize.X - 1;
  if (y1 == 0)
    sr1.Top = dev_state->info.winTop;
  else
    sr1.Top = y1 > 0 ? y1 : dev_state->info.winBottom;
  sr1.Right = x2 >= 0 ? x2 : dev_state->info.dwWinSize.X - 1;
  if (y2 == 0)
    sr1.Bottom = dev_state->info.winTop;
  else
    sr1.Bottom = y2 > 0 ? y2 : dev_state->info.winBottom;
  sr2.Top = srTop;
  sr2.Left = 0;
  sr2.Bottom = srBottom;
  sr2.Right = dev_state->info.dwWinSize.X - 1;
  if (sr1.Bottom > sr2.Bottom && sr1.Top <= sr2.Bottom)
    sr1.Bottom = sr2.Bottom;
  dest.X = xn >= 0 ? xn : dev_state->info.dwWinSize.X - 1;
  if (yn == 0)
    dest.Y = dev_state->info.winTop;
  else
    dest.Y = yn > 0 ? yn : dev_state->info.winBottom;
  fill.Char.AsciiChar = ' ';
  fill.Attributes = dev_state->current_win32_attr;
  ScrollConsoleScreenBuffer (get_output_handle (), &sr1, &sr2, dest, &fill);

  /* ScrollConsoleScreenBuffer on Windows 95 is buggy - when scroll distance
   * is more than half of screen, filling doesn't work as expected */

  if (sr1.Top != sr1.Bottom)
    if (dest.Y <= sr1.Top)	/* forward scroll */
      clear_screen (0, 1 + dest.Y + sr1.Bottom - sr1.Top, sr2.Right, sr2.Bottom);
    else			/* reverse scroll */
      clear_screen (0, sr1.Top, sr2.Right, dest.Y - 1);
}

int
fhandler_console::open (int flags, mode_t)
{
  HANDLE h;

  tcinit (get_tty_stuff (flags));

  set_io_handle (NULL);
  set_output_handle (NULL);

  set_flags ((flags & ~O_TEXT) | O_BINARY);

  /* Open the input handle as handle_ */
  h = CreateFile ("CONIN$", GENERIC_READ | GENERIC_WRITE,
		  FILE_SHARE_READ | FILE_SHARE_WRITE, &sec_none,
		  OPEN_EXISTING, 0, 0);

  if (h == INVALID_HANDLE_VALUE)
    {
      __seterrno ();
      return 0;
    }
  set_io_handle (h);
  uninterruptible_io (true);	// Handled explicitly in read code

  h = CreateFile ("CONOUT$", GENERIC_READ | GENERIC_WRITE,
		  FILE_SHARE_READ | FILE_SHARE_WRITE, &sec_none,
		  OPEN_EXISTING, 0, 0);

  if (h == INVALID_HANDLE_VALUE)
    {
      __seterrno ();
      return 0;
    }
  set_output_handle (h);

  if (dev_state->fillin_info (get_output_handle ()))
    {
      dev_state->current_win32_attr = dev_state->info.wAttributes;
      if (!dev_state->default_color)
	dev_state->default_color = dev_state->info.wAttributes;
      dev_state->set_default_attr ();
    }

  tc->rstcons (false);
  set_open_status ();
  cygheap->manage_console_count ("fhandler_console::open", 1);

  DWORD cflags;
  if (GetConsoleMode (get_io_handle (), &cflags))
    SetConsoleMode (get_io_handle (),
		    ENABLE_WINDOW_INPUT | ENABLE_MOUSE_INPUT | cflags);

  debug_printf ("opened conin$ %p, conout$ %p", get_io_handle (),
		get_output_handle ());

  return 1;
}

int
fhandler_console::close ()
{
  CloseHandle (get_io_handle ());
  CloseHandle (get_output_handle ());
  if (!hExeced)
    cygheap->manage_console_count ("fhandler_console::close", -1);
  return 0;
}

/*  Special console dup to duplicate input and output  handles.  */

int
fhandler_console::dup (fhandler_base *child)
{
  fhandler_console *fhc = (fhandler_console *) child;

  if (!fhc->open (get_flags () & ~O_NOCTTY, 0))
    system_printf ("error opening console, %E");

  return 0;
}

int
fhandler_console::ioctl (unsigned int cmd, void *buf)
{
  switch (cmd)
    {
      case TIOCGWINSZ:
	int st;

	st = dev_state->fillin_info (get_output_handle ());
	if (st)
	  {
	    /* *not* the buffer size, the actual screen size... */
	    /* based on Left Top Right Bottom of srWindow */
	    ((struct winsize *) buf)->ws_row = dev_state->info.dwWinSize.Y;
	    ((struct winsize *) buf)->ws_col = dev_state->info.dwWinSize.X;
	    syscall_printf ("WINSZ: (row=%d,col=%d)",
			   ((struct winsize *) buf)->ws_row,
			   ((struct winsize *) buf)->ws_col);
	    return 0;
	  }
	else
	  {
	    syscall_printf ("WINSZ failed");
	    __seterrno ();
	    return -1;
	  }
	return 0;
      case TIOCSWINSZ:
	bg_check (SIGTTOU);
	return 0;
      case KDGKBMETA:
	*(int *) buf = (dev_state->metabit) ? K_METABIT : K_ESCPREFIX;
	return 0;
      case KDSKBMETA:
	if ((int) buf == K_METABIT)
	  dev_state->metabit = TRUE;
	else if ((int) buf == K_ESCPREFIX)
	  dev_state->metabit = FALSE;
	else
	  {
	    set_errno (EINVAL);
	    return -1;
	  }
	return 0;
      case TIOCLINUX:
	if (* (int *) buf == 6)
	  {
	    * (int *) buf = dev_state->nModifiers;
	    return 0;
	  }
	else
	  {
	    set_errno (EINVAL);
	    return -1;
	  }
    }

  return fhandler_base::ioctl (cmd, buf);
}

int
fhandler_console::tcflush (int queue)
{
  int res = 0;
  if (queue == TCIFLUSH
      || queue == TCIOFLUSH)
    {
      if (!FlushConsoleInputBuffer (get_io_handle ()))
	{
	  __seterrno ();
	  res = -1;
	}
    }
  return res;
}

int
fhandler_console::output_tcsetattr (int, struct termios const *t)
{
  /* All the output bits we can ignore */

  DWORD flags = ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT;

  int res = SetConsoleMode (get_output_handle (), flags) ? 0 : -1;
  syscall_printf ("%d = tcsetattr (,%x) (ENABLE FLAGS %x) (lflag %x oflag %x)",
		  res, t, flags, t->c_lflag, t->c_oflag);
  return res;
}

int
fhandler_console::input_tcsetattr (int, struct termios const *t)
{
  /* Ignore the optional_actions stuff, since all output is emitted
     instantly */

  DWORD oflags;

  if (!GetConsoleMode (get_io_handle (), &oflags))
    oflags = 0;
  DWORD flags = 0;

#if 0
  /* Enable/disable LF -> CRLF conversions */
  rbinary ((t->c_iflag & INLCR) ? false : true);
#endif

  /* There's some disparity between what we need and what's
     available.  We've got ECHO and ICANON, they've
     got ENABLE_ECHO_INPUT and ENABLE_LINE_INPUT. */

  tc->ti = *t;

  if (t->c_lflag & ECHO)
    {
      flags |= ENABLE_ECHO_INPUT;
    }
  if (t->c_lflag & ICANON)
    {
      flags |= ENABLE_LINE_INPUT;
    }

  if (flags & ENABLE_ECHO_INPUT
      && !(flags & ENABLE_LINE_INPUT))
    {
      /* This is illegal, so turn off the echo here, and fake it
	 when we read the characters */

      flags &= ~ENABLE_ECHO_INPUT;
    }

  if (t->c_lflag & ISIG)
    {
      flags |= ENABLE_PROCESSED_INPUT;
    }

  if (use_tty)
    {
      flags = 0; // ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT;
      tc->ti.c_iflag = 0;
      tc->ti.c_lflag = 0;
    }

  flags |= ENABLE_WINDOW_INPUT | ENABLE_MOUSE_INPUT;

  int res;
  if (flags == oflags)
    res = 0;
  else
    {
      res = SetConsoleMode (get_io_handle (), flags) ? 0 : -1;
      if (res < 0)
	__seterrno ();
      syscall_printf ("%d = tcsetattr (,%x) enable flags %p, c_lflag %p iflag %p",
		      res, t, flags, t->c_lflag, t->c_iflag);
    }

  tc->rstcons (false);
  return res;
}

int
fhandler_console::tcsetattr (int a, struct termios const *t)
{
  int res = output_tcsetattr (a, t);
  if (res != 0)
    return res;
  return input_tcsetattr (a, t);
}

int
fhandler_console::tcgetattr (struct termios *t)
{
  int res;
  *t = tc->ti;

  t->c_cflag |= CS8;

  DWORD flags;

  if (!GetConsoleMode (get_io_handle (), &flags))
    {
      __seterrno ();
      res = -1;
    }
  else
    {
      if (flags & ENABLE_ECHO_INPUT)
	t->c_lflag |= ECHO;

      if (flags & ENABLE_LINE_INPUT)
	t->c_lflag |= ICANON;

      if (flags & ENABLE_PROCESSED_INPUT)
	t->c_lflag |= ISIG;

      /* What about ENABLE_WINDOW_INPUT
	 and ENABLE_MOUSE_INPUT   ? */

      /* All the output bits we can ignore */
      res = 0;
    }
  syscall_printf ("%d = tcgetattr (%p) enable flags %p, t->lflag %p, t->iflag %p",
		 res, t, flags, t->c_lflag, t->c_iflag);
  return res;
}

fhandler_console::fhandler_console () :
  fhandler_termios ()
{
  trunc_buf.len = 0;
}

void
dev_console::set_color (HANDLE h)
{
  WORD win_fg = fg;
  WORD win_bg = bg;
  if (reverse)
    {
      WORD save_fg = win_fg;
      win_fg = (win_bg & BACKGROUND_RED   ? FOREGROUND_RED   : 0) |
	       (win_bg & BACKGROUND_GREEN ? FOREGROUND_GREEN : 0) |
	       (win_bg & BACKGROUND_BLUE  ? FOREGROUND_BLUE  : 0) |
	       (win_bg & BACKGROUND_INTENSITY ? FOREGROUND_INTENSITY : 0);
      win_bg = (save_fg & FOREGROUND_RED   ? BACKGROUND_RED   : 0) |
	       (save_fg & FOREGROUND_GREEN ? BACKGROUND_GREEN : 0) |
	       (save_fg & FOREGROUND_BLUE  ? BACKGROUND_BLUE  : 0) |
	       (save_fg & FOREGROUND_INTENSITY ? BACKGROUND_INTENSITY : 0);
    }

  /* apply attributes */
  if (underline)
    win_fg = underline_color;
  /* emulate blink with bright background */
  if (blink)
    win_bg |= BACKGROUND_INTENSITY;
  if (intensity == INTENSITY_INVISIBLE)
    win_fg = win_bg;
  else if (intensity == INTENSITY_BOLD)
    /* apply foreground intensity only in non-reverse mode! */
    if (reverse)
      win_bg |= BACKGROUND_INTENSITY;
    else
      win_fg |= FOREGROUND_INTENSITY;

  current_win32_attr = win_fg | win_bg;
  if (h)
    SetConsoleTextAttribute (h, current_win32_attr);
}

#define FOREGROUND_ATTR_MASK (FOREGROUND_RED | FOREGROUND_GREEN | \
			      FOREGROUND_BLUE | FOREGROUND_INTENSITY)
#define BACKGROUND_ATTR_MASK (BACKGROUND_RED | BACKGROUND_GREEN | \
			      BACKGROUND_BLUE | BACKGROUND_INTENSITY)
void
dev_console::set_default_attr ()
{
  blink = underline = reverse = false;
  intensity = INTENSITY_NORMAL;
  fg = default_color & FOREGROUND_ATTR_MASK;
  bg = default_color & BACKGROUND_ATTR_MASK;
  set_color (NULL);
}

/*
 * Clear the screen context from x1/y1 to x2/y2 cell.
 * Negative values represents current screen dimensions
 */
void
fhandler_console::clear_screen (int x1, int y1, int x2, int y2)
{
  COORD tlc;
  DWORD done;
  int num;

  dev_state->fillin_info (get_output_handle ());

  if (x1 < 0)
    x1 = dev_state->info.dwWinSize.X - 1;
  if (y1 < 0)
    y1 = dev_state->info.winBottom;
  if (x2 < 0)
    x2 = dev_state->info.dwWinSize.X - 1;
  if (y2 < 0)
    y2 = dev_state->info.winBottom;

  num = abs (y1 - y2) * dev_state->info.dwBufferSize.X + abs (x1 - x2) + 1;

  if ((y2 * dev_state->info.dwBufferSize.X + x2) > (y1 * dev_state->info.dwBufferSize.X + x1))
    {
      tlc.X = x1;
      tlc.Y = y1;
    }
  else
    {
      tlc.X = x2;
      tlc.Y = y2;
    }
  FillConsoleOutputCharacterA (get_output_handle (), ' ',
			       num,
			       tlc,
			       &done);
  FillConsoleOutputAttribute (get_output_handle (),
			       dev_state->current_win32_attr,
			       num,
			       tlc,
			       &done);
}

void
fhandler_console::cursor_set (bool rel_to_top, int x, int y)
{
  COORD pos;

  dev_state->fillin_info (get_output_handle ());
  if (y > dev_state->info.winBottom)
    y = dev_state->info.winBottom;
  else if (y < 0)
    y = 0;
  else if (rel_to_top)
    y += dev_state->info.winTop;

  if (x > dev_state->info.dwWinSize.X)
    x = dev_state->info.dwWinSize.X - 1;
  else if (x < 0)
    x = 0;

  pos.X = x;
  pos.Y = y;
  SetConsoleCursorPosition (get_output_handle (), pos);
}

void
fhandler_console::cursor_rel (int x, int y)
{
  dev_state->fillin_info (get_output_handle ());
  x += dev_state->info.dwCursorPosition.X;
  y += dev_state->info.dwCursorPosition.Y;
  cursor_set (false, x, y);
}

void
fhandler_console::cursor_get (int *x, int *y)
{
  dev_state->fillin_info (get_output_handle ());
  *y = dev_state->info.dwCursorPosition.Y;
  *x = dev_state->info.dwCursorPosition.X;
}

#define BAK 1
#define ESC 2
#define NOR 0
#define IGN 4
#if 1
#define ERR 5
#else
#define ERR NOR
#endif
#define DWN 6
#define BEL 7
#define TAB 8 /* We should't let the console deal with these */
#define CR 13
#define LF 10

static const char base_chars[256] =
{
/*00 01 02 03 04 05 06 07 */ IGN, ERR, ERR, NOR, NOR, NOR, NOR, BEL,
/*08 09 0A 0B 0C 0D 0E 0F */ BAK, TAB, DWN, ERR, ERR, CR,  ERR, IGN,
/*10 11 12 13 14 15 16 17 */ NOR, NOR, ERR, ERR, ERR, ERR, ERR, ERR,
/*18 19 1A 1B 1C 1D 1E 1F */ NOR, NOR, ERR, ESC, ERR, ERR, ERR, ERR,
/*   !  "  #  $  %  &  '  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*(  )  *  +  ,  -  .  /  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*0  1  2  3  4  5  6  7  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*8  9  :  ;  <  =  >  ?  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*@  A  B  C  D  E  F  G  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*H  I  J  K  L  M  N  O  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*P  Q  R  S  T  U  V  W  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*X  Y  Z  [  \  ]  ^  _  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*`  a  b  c  d  e  f  g  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*h  i  j  k  l  m  n  o  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*p  q  r  s  t  u  v  w  */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*x  y  z  {  |  }  ~  7F */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*80 81 82 83 84 85 86 87 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*88 89 8A 8B 8C 8D 8E 8F */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*90 91 92 93 94 95 96 97 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*98 99 9A 9B 9C 9D 9E 9F */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*A0 A1 A2 A3 A4 A5 A6 A7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*A8 A9 AA AB AC AD AE AF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*B0 B1 B2 B3 B4 B5 B6 B7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*B8 B9 BA BB BC BD BE BF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*C0 C1 C2 C3 C4 C5 C6 C7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*C8 C9 CA CB CC CD CE CF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*D0 D1 D2 D3 D4 D5 D6 D7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*D8 D9 DA DB DC DD DE DF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*E0 E1 E2 E3 E4 E5 E6 E7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*E8 E9 EA EB EC ED EE EF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*F0 F1 F2 F3 F4 F5 F6 F7 */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR,
/*F8 F9 FA FB FC FD FE FF */ NOR, NOR, NOR, NOR, NOR, NOR, NOR, NOR };

void
fhandler_console::char_command (char c)
{
  int x, y;
  char buf[40];

  switch (c)
    {
    case 'm':   /* Set Graphics Rendition */
       for (int i = 0; i <= dev_state->nargs_; i++)
	 switch (dev_state->args_[i])
	   {
	     case 0:    /* normal color */
	       dev_state->set_default_attr ();
	       break;
	     case 1:    /* bold */
	       dev_state->intensity = INTENSITY_BOLD;
	       break;
	     case 4:
	       dev_state->underline = 1;
	       break;
	     case 5:    /* blink mode */
	       dev_state->blink = true;
	       break;
	     case 7:    /* reverse */
	       dev_state->reverse = true;
	       break;
	     case 8:    /* invisible */
	       dev_state->intensity = INTENSITY_INVISIBLE;
	       break;
	     case 9:    /* dim */
	       dev_state->intensity = INTENSITY_DIM;
	       break;
	     case 10:   /* end alternate charset */
	       dev_state->alternate_charset_active = false;
	       break;
	     case 11:   /* start alternate charset */
	       dev_state->alternate_charset_active = true;
	       break;
	     case 24:
	       dev_state->underline = false;
	       break;
	     case 27:
	       dev_state->reverse = false;
	       break;
	     case 30:		/* BLACK foreground */
	       dev_state->fg = 0;
	       break;
	     case 31:		/* RED foreground */
	       dev_state->fg = FOREGROUND_RED;
	       break;
	     case 32:		/* GREEN foreground */
	       dev_state->fg = FOREGROUND_GREEN;
	       break;
	     case 33:		/* YELLOW foreground */
	       dev_state->fg = FOREGROUND_RED | FOREGROUND_GREEN;
	       break;
	     case 34:		/* BLUE foreground */
	       dev_state->fg = FOREGROUND_BLUE;
	       break;
	     case 35:		/* MAGENTA foreground */
	       dev_state->fg = FOREGROUND_RED | FOREGROUND_BLUE;
	       break;
	     case 36:		/* CYAN foreground */
	       dev_state->fg = FOREGROUND_BLUE | FOREGROUND_GREEN;
	       break;
	     case 37:		/* WHITE foreg */
	       dev_state->fg = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED;
	       break;
	     case 39:
	       dev_state->fg = dev_state->default_color & FOREGROUND_ATTR_MASK;
	       break;
	     case 40:		/* BLACK background */
	       dev_state->bg = 0;
	       break;
	     case 41:		/* RED background */
	       dev_state->bg = BACKGROUND_RED;
	       break;
	     case 42:		/* GREEN background */
	       dev_state->bg = BACKGROUND_GREEN;
	       break;
	     case 43:		/* YELLOW background */
	       dev_state->bg = BACKGROUND_RED | BACKGROUND_GREEN;
	       break;
	     case 44:		/* BLUE background */
	       dev_state->bg = BACKGROUND_BLUE;
	       break;
	     case 45:		/* MAGENTA background */
	       dev_state->bg = BACKGROUND_RED | BACKGROUND_BLUE;
	       break;
	     case 46:		/* CYAN background */
	       dev_state->bg = BACKGROUND_BLUE | BACKGROUND_GREEN;
	       break;
	     case 47:    /* WHITE background */
	       dev_state->bg = BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED;
	       break;
	     case 49:
	       dev_state->bg = dev_state->default_color & BACKGROUND_ATTR_MASK;
	       break;
	   }
       dev_state->set_color (get_output_handle ());
      break;
    case 'h':
    case 'l':
      if (!dev_state->saw_question_mark)
	{
	  switch (dev_state->args_[0])
	    {
	    case 4:    /* Insert mode */
	      dev_state->insert_mode = (c == 'h') ? true : false;
	      syscall_printf ("insert mode %sabled", dev_state->insert_mode ? "en" : "dis");
	      break;
	    }
	  break;
	}
      switch (dev_state->args_[0])
	{
	case 47:   /* Save/Restore screen */
	  if (c == 'h') /* save */
	    {
	      CONSOLE_SCREEN_BUFFER_INFO now;
	      COORD cob = { 0, 0 };

	      if (!GetConsoleScreenBufferInfo (get_output_handle (), &now))
		break;

	      dev_state->savebufsiz.X = now.srWindow.Right - now.srWindow.Left + 1;
	      dev_state->savebufsiz.Y = now.srWindow.Bottom - now.srWindow.Top + 1;

	      if (dev_state->savebuf)
		cfree (dev_state->savebuf);
	      dev_state->savebuf = (PCHAR_INFO) cmalloc_abort (HEAP_1_BUF, sizeof (CHAR_INFO) *
					     dev_state->savebufsiz.X * dev_state->savebufsiz.Y);

	      ReadConsoleOutputW (get_output_handle (), dev_state->savebuf,
				  dev_state->savebufsiz, cob, &now.srWindow);
	    }
	  else		/* restore */
	    {
	      CONSOLE_SCREEN_BUFFER_INFO now;
	      COORD cob = { 0, 0 };

	      if (!GetConsoleScreenBufferInfo (get_output_handle (), &now))
		break;

	      if (!dev_state->savebuf)
		break;

	      WriteConsoleOutputW (get_output_handle (), dev_state->savebuf,
				   dev_state->savebufsiz, cob, &now.srWindow);

	      cfree (dev_state->savebuf);
	      dev_state->savebuf = NULL;
	      dev_state->savebufsiz.X = dev_state->savebufsiz.Y = 0;
	    }
	  break;

	case 1000: /* Mouse support */
	  dev_state->use_mouse = (c == 'h') ? true : false;
	  syscall_printf ("mouse support %sabled", dev_state->use_mouse ? "en" : "dis");
	  break;

	case 2000: /* Raw keyboard mode */
	  set_raw_win32_keyboard_mode ((c == 'h') ? true : false);
	  break;

	default: /* Ignore */
	  syscall_printf ("unknown h/l command: %d", dev_state->args_[0]);
	  break;
	}
      break;
    case 'J':
      switch (dev_state->args_[0])
	{
	case 0:			/* Clear to end of screen */
	  cursor_get (&x, &y);
	  clear_screen (x, y, -1, -1);
	  break;
	case 1:			/* Clear from beginning of screen to cursor */
	  cursor_get (&x, &y);
	  clear_screen (0, 0, x, y);
	  break;
	case 2:			/* Clear screen */
	  clear_screen (0, 0, -1, -1);
	  cursor_set (true, 0,0);
	  break;
	default:
	  goto bad_escape;
	}
      break;

    case 'A':
      cursor_rel (0, -(dev_state->args_[0] ? dev_state->args_[0] : 1));
      break;
    case 'B':
      cursor_rel (0, dev_state->args_[0] ? dev_state->args_[0] : 1);
      break;
    case 'C':
      cursor_rel (dev_state->args_[0] ? dev_state->args_[0] : 1, 0);
      break;
    case 'D':
      cursor_rel (-(dev_state->args_[0] ? dev_state->args_[0] : 1),0);
      break;
    case 'K':
      switch (dev_state->args_[0])
	{
	  case 0:		/* Clear to end of line */
	    cursor_get (&x, &y);
	    clear_screen (x, y, -1, y);
	    break;
	  case 2:		/* Clear line */
	    cursor_get (&x, &y);
	    clear_screen (0, y, -1, y);
	    break;
	  case 1:		/* Clear from bol to cursor */
	    cursor_get (&x, &y);
	    clear_screen (0, y, x, y);
	    break;
	  default:
	    goto bad_escape;
	}
      break;
    case 'H':
    case 'f':
      cursor_set (true, (dev_state->args_[1] ? dev_state->args_[1] : 1) - 1,
			(dev_state->args_[0] ? dev_state->args_[0] : 1) - 1);
      break;
    case 'G':   /* hpa - position cursor at column n - 1 */
      cursor_get (&x, &y);
      cursor_set (false, (dev_state->args_[0] ? dev_state->args_[0] - 1 : 0), y);
      break;
    case 'd':   /* vpa - position cursor at line n */
      cursor_get (&x, &y);
      cursor_set (true, x, (dev_state->args_[0] ? dev_state->args_[0] - 1 : 0));
      break;
    case 's':   /* Save cursor position */
      cursor_get (&dev_state->savex, &dev_state->savey);
      dev_state->savey -= dev_state->info.winTop;
      break;
    case 'u':   /* Restore cursor position */
      cursor_set (true, dev_state->savex, dev_state->savey);
      break;
    case 'I':	/* TAB */
      cursor_get (&x, &y);
      cursor_set (false, 8 * (x / 8 + 1), y);
      break;
    case 'L':				/* AL - insert blank lines */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      cursor_get (&x, &y);
      scroll_screen (0, y, -1, -1, 0, y + dev_state->args_[0]);
      break;
    case 'M':				/* DL - delete lines */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      cursor_get (&x, &y);
      scroll_screen (0, y + dev_state->args_[0], -1, -1, 0, y);
      break;
    case '@':				/* IC - insert chars */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      cursor_get (&x, &y);
      scroll_screen (x, y, -1, y, x + dev_state->args_[0], y);
      break;
    case 'P':				/* DC - delete chars */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      cursor_get (&x, &y);
      scroll_screen (x + dev_state->args_[0], y, -1, y, x, y);
      break;
    case 'S':				/* SF - Scroll forward */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      scroll_screen (0, dev_state->args_[0], -1, -1, 0, 0);
      break;
    case 'T':				/* SR - Scroll down */
      dev_state->fillin_info (get_output_handle ());
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      scroll_screen (0, 0, -1, -1, 0, dev_state->info.winTop + dev_state->args_[0]);
      break;
    case 'X':				/* ec - erase chars */
      dev_state->args_[0] = dev_state->args_[0] ? dev_state->args_[0] : 1;
      cursor_get (&x, &y);
      scroll_screen (x + dev_state->args_[0], y, -1, y, x, y);
      scroll_screen (x, y, -1, y, x + dev_state->args_[0], y);
      break;
    case 'Z':				/* Back tab */
      cursor_get (&x, &y);
      cursor_set (false, ((8 * (x / 8 + 1)) - 8), y);
      break;
    case 'b':				/* Repeat char #1 #2 times */
      if (dev_state->insert_mode)
	{
	  cursor_get (&x, &y);
	  scroll_screen (x, y, -1, y, x + dev_state->args_[1], y);
	}
      while (dev_state->args_[1]--)
	WriteFile (get_output_handle (), &dev_state->args_[0], 1, (DWORD *) &x, 0);
      break;
    case 'c':				/* u9 - Terminal enquire string */
      strcpy (buf, "\033[?6c");
      puts_readahead (buf);
      break;
    case 'n':
      switch (dev_state->args_[0])
	{
	case 6:				/* u7 - Cursor position request */
	  cursor_get (&x, &y);
	  y -= dev_state->info.winTop;
	  /* x -= dev_state->info.winLeft;		// not available yet */
	  __small_sprintf (buf, "\033[%d;%dR", y + 1, x + 1);
	  puts_readahead (buf);
	  break;
    default:
	  goto bad_escape;
	}
      break;
    case 'r':				/* Set Scroll region */
      dev_state->scroll_region.Top = dev_state->args_[0] ? dev_state->args_[0] - 1 : 0;
      dev_state->scroll_region.Bottom = dev_state->args_[1] ? dev_state->args_[1] - 1 : -1;
      cursor_set (true, 0, 0);
      break;
    case 'g':				/* TAB set/clear */
      break;
    default:
bad_escape:
      break;
    }
}

static void
beep ()
{
  reg_key r (HKEY_CURRENT_USER, KEY_ALL_ACCESS, "AppEvents", "Schemes", "Apps",
	     ".Default", ".Default", ".Current", NULL);
  if (r.created ())
    {
      char *buf = NULL;
      UINT len = GetWindowsDirectory (buf, 0);
      buf = (char *) alloca (len += sizeof ("\\media\\ding.wav"));
      UINT res = GetWindowsDirectory (buf, len);
      if (res && res <= len)
	r.set_string ("", strcat (buf, "\\media\\ding.wav"));
    }
  MessageBeep (MB_OK);
}

/* This gets called when we found an invalid UTF-8 character.  We try with
   the default ANSI codepage.  If that fails we just print a question mark.
   Looks ugly but is a neat and alomst sane fallback for many languages. */
void
fhandler_console::write_replacement_char (const unsigned char *char_p)
{
  int n;
  WCHAR def_cp_chars[2];
  DWORD done;

  n = MultiByteToWideChar (GetACP (), 0, (const CHAR *) char_p, 1,
			   def_cp_chars, 2);
  if (n)
    WriteConsoleW (get_output_handle (), def_cp_chars, n, &done, 0);
  else
    WriteConsoleW (get_output_handle (), L"?", 1, &done, 0);
}

const unsigned char *
fhandler_console::write_normal (const unsigned char *src,
				const unsigned char *end)
{
  /* Scan forward to see what a char which needs special treatment */
  DWORD done;
  DWORD buf_len;
  const unsigned char *found = src;
  const unsigned char *nfound;
  UINT cp = dev_state->get_console_cp ();

  /* First check if we have cached lead bytes of a former try to write
     a truncated multibyte sequence.  If so, process it. */
  if (trunc_buf.len)
    {
      int cp_len = min (end - src, 4 - trunc_buf.len);
      memcpy (trunc_buf.buf + trunc_buf.len, src, cp_len);
      nfound = next_char (cp, trunc_buf.buf,
			  trunc_buf.buf + trunc_buf.len + cp_len);
      /* Still truncated multibyte sequence?  Keep in trunc_buf. */
      if (nfound == trunc_buf.buf)
	{
	  trunc_buf.len += cp_len;
	  return end;
	}
      /* Valid multibyte sequence?  Process. */
      if (nfound)
	{
	  buf_len = dev_state->str_to_con (write_buf,
					   (const char *) trunc_buf.buf,
					   nfound - trunc_buf.buf);
	  WriteConsoleW (get_output_handle (), write_buf, buf_len, &done, 0);
	  found = src + (nfound - trunc_buf.buf - trunc_buf.len);
	  trunc_buf.len = 0;
	  return found;
	}
      /* Give up, print replacement chars for trunc_buf... */
      for (int i = 0; i < trunc_buf.len; ++i)
	write_replacement_char (trunc_buf.buf + i);
      /* ... mark trunc_buf as unused... */
      trunc_buf.len = 0;
      /* ... and proceed. */
    }

  while (found < end
	 && found - src < CONVERT_LIMIT
	 && base_chars[*found] == NOR)
    {
      nfound = next_char (cp, found, end);
      if (!nfound)		/* Invalid multibyte sequence. */
	break;
      if (nfound == found)	/* Truncated multibyte sequence. */
	{			/* Stick to it until the next write. */
	  trunc_buf.len = end - found;
	  memcpy (trunc_buf.buf, found, trunc_buf.len);
	  return end;
	}
      found = nfound;
    }

  /* Print all the base ones out */
  if (found != src)
    {
      DWORD len = found - src;
      buf_len = dev_state->str_to_con (write_buf, (const char *) src, len);
      if (!buf_len)
	{
	  debug_printf ("conversion error, handle %p",
			get_output_handle ());
	  __seterrno ();
	  return 0;
	}

      if (dev_state->insert_mode)
	{
	  int x, y;
	  cursor_get (&x, &y);
	  scroll_screen (x, y, -1, y, x + buf_len, y);
	}

      register PWCHAR buf = write_buf;
      do
	{
	  if (!WriteConsoleW (get_output_handle (), buf, buf_len, &done, 0))
	    {
	      debug_printf ("write failed, handle %p", get_output_handle ());
	      __seterrno ();
	      return 0;
	    }
	  buf_len -= done;
	  buf += done;
	}
      while (buf_len > 0);
      if (len >= CONVERT_LIMIT)
	return found;
    }

  if (found < end)
    {
      int x, y;
      switch (base_chars[*found])
	{
	case BEL:
	  beep ();
	  break;
	case ESC:
	  dev_state->state_ = gotesc;
	  break;
	case DWN:
	  cursor_get (&x, &y);
	  if (y >= srBottom)
	    {
	      if (y >= dev_state->info.winBottom && !dev_state->scroll_region.Top)
		WriteConsoleW (get_output_handle (), L"\n", 1, &done, 0);
	      else
		{
		  scroll_screen (0, srTop + 1, -1, srBottom, 0, srTop);
		  y--;
		}
	    }
	  cursor_set (false, ((tc->ti.c_oflag & ONLCR) ? 0 : x), y + 1);
	  break;
	case BAK:
	  cursor_rel (-1, 0);
	  break;
	case IGN:
	  cursor_rel (1, 0);
	  break;
	case CR:
	  cursor_get (&x, &y);
	  cursor_set (false, 0, y);
	  break;
	case ERR:
	  /* Don't print chars marked as ERR chars. */
	  break;
	case TAB:
	  cursor_get (&x, &y);
	  cursor_set (false, 8 * (x / 8 + 1), y);
	  break;
	case NOR:
	  write_replacement_char (found);
	  break;
	}
      found++;
    }
  return found;
}

int
fhandler_console::write (const void *vsrc, size_t len)
{
  /* Run and check for ansi sequences */
  unsigned const char *src = (unsigned char *) vsrc;
  unsigned const char *end = src + len;
  /* This might look a bit far fetched, but using the TLS path buffer allows
     to allocate a big buffer without using the stack too much.  Doing it here
     in write instead of in write_normal should be faster, too. */
  tmp_pathbuf tp;
  write_buf = tp.w_get ();

  debug_printf ("%x, %d", vsrc, len);

  while (src < end)
    {
      debug_printf ("at %d(%c) state is %d", *src, isprint (*src) ? *src : ' ',
		    dev_state->state_);
      switch (dev_state->state_)
	{
	case normal:
	  src = write_normal (src, end);
	  if (!src) /* write_normal failed */
	    return -1;
	  break;
	case gotesc:
	  if (*src == '[')
	    {
	      dev_state->state_ = gotsquare;
	      dev_state->saw_question_mark = false;
	      for (dev_state->nargs_ = 0; dev_state->nargs_ < MAXARGS; dev_state->nargs_++)
		dev_state->args_[dev_state->nargs_] = 0;
	      dev_state->nargs_ = 0;
	    }
	  else if (*src == ']')
	    {
	      dev_state->rarg = 0;
	      dev_state->my_title_buf[0] = '\0';
	      dev_state->state_ = gotrsquare;
	    }
	  else if (*src == 'M')		/* Reverse Index */
	    {
	      dev_state->fillin_info (get_output_handle ());
	      scroll_screen (0, 0, -1, -1, 0, dev_state->info.winTop + 1);
	      dev_state->state_ = normal;
	    }
	  else if (*src == 'c')		/* Reset Linux terminal */
	    {
	      dev_state->set_default_attr ();
	      clear_screen (0, 0, -1, -1);
	      cursor_set (true, 0, 0);
	      dev_state->state_ = normal;
	    }
	  else if (*src == '8')		/* Restore cursor position */
	    {
	      cursor_set (true, dev_state->savex, dev_state->savey);
	      dev_state->state_ = normal;
	    }
	  else if (*src == '7')		/* Save cursor position */
	    {
	      cursor_get (&dev_state->savex, &dev_state->savey);
	      dev_state->savey -= dev_state->info.winTop;
	      dev_state->state_ = normal;
	    }
	  else if (*src == 'R')
	      dev_state->state_ = normal;
	  else
	    {
	      dev_state->state_ = normal;
	    }
	  src++;
	  break;
	case gotarg1:
	  if (isdigit (*src))
	    {
	      dev_state->args_[dev_state->nargs_] = dev_state->args_[dev_state->nargs_] * 10 + *src - '0';
	      src++;
	    }
	  else if (*src == ';')
	    {
	      src++;
	      dev_state->nargs_++;
	      if (dev_state->nargs_ >= MAXARGS)
		dev_state->nargs_--;
	    }
	  else
	    {
	      dev_state->state_ = gotcommand;
	    }
	  break;
	case gotcommand:
	  char_command (*src++);
	  dev_state->state_ = normal;
	  break;
	case gotrsquare:
	  if (isdigit (*src))
	    dev_state->rarg = dev_state->rarg * 10 + (*src - '0');
	  else if (*src == ';' && (dev_state->rarg == 2 || dev_state->rarg == 0))
	    dev_state->state_ = gettitle;
	  else
	    dev_state->state_ = eattitle;
	  src++;
	  break;
	case eattitle:
	case gettitle:
	  {
	    int n = strlen (dev_state->my_title_buf);
	    if (*src < ' ')
	      {
		if (*src == '\007' && dev_state->state_ == gettitle)
		  {
		    if (old_title)
		      strcpy (old_title, dev_state->my_title_buf);
		    set_console_title (dev_state->my_title_buf);
		  }
		dev_state->state_ = normal;
	      }
	    else if (n < TITLESIZE)
	      {
		dev_state->my_title_buf[n++] = *src;
		dev_state->my_title_buf[n] = '\0';
	      }
	    src++;
	    break;
	  }
	case gotsquare:
	  if (*src == ';')
	    {
	      dev_state->state_ = gotarg1;
	      dev_state->nargs_++;
	      src++;
	    }
	  else if (isalpha (*src))
	    dev_state->state_ = gotcommand;
	  else if (*src != '@' && !isalpha (*src) && !isdigit (*src))
	    {
	      if (*src == '?')
		dev_state->saw_question_mark = true;
	      /* ignore any extra chars between [ and first arg or command */
	      src++;
	    }
	  else
	    dev_state->state_ = gotarg1;
	  break;
	}
    }

  syscall_printf ("%d = write_console (,..%d)", len, len);

  return len;
}

static struct {
  int vk;
  const char *val[4];
} keytable[] NO_COPY = {
	       /* NORMAL */  /* SHIFT */    /* CTRL */       /* ALT */
  {VK_LEFT,	{"\033[D",	"\033[D",	"\033[D",	"\033\033[D"}},
  {VK_RIGHT,	{"\033[C",	"\033[C",	"\033[C",	"\033\033[C"}},
  {VK_UP,	{"\033[A",	"\033[A",	"\033[A",	"\033\033[A"}},
  {VK_DOWN,	{"\033[B",	"\033[B",	"\033[B",	"\033\033[B"}},
  {VK_PRIOR,	{"\033[5~",	"\033[5~",	"\033[5~",	"\033\033[5~"}},
  {VK_NEXT,	{"\033[6~",	"\033[6~",	"\033[6~",	"\033\033[6~"}},
  {VK_HOME,	{"\033[1~",	"\033[1~",	"\033[1~",	"\033\033[1~"}},
  {VK_END,	{"\033[4~",	"\033[4~",	"\033[4~",	"\033\033[4~"}},
  {VK_INSERT,	{"\033[2~",	"\033[2~",	"\033[2~",	"\033\033[2~"}},
  {VK_DELETE,	{"\033[3~",	"\033[3~",	"\033[3~",	"\033\033[3~"}},
  {VK_F1,	{"\033[[A",	"\033[23~",	NULL,		NULL}},
  {VK_F2,	{"\033[[B",	"\033[24~",	NULL,		NULL}},
  {VK_F3,	{"\033[[C",	"\033[25~",	NULL,		NULL}},
  {VK_F4,	{"\033[[D",	"\033[26~",	NULL,		NULL}},
  {VK_F5,	{"\033[[E",	"\033[28~",	NULL,		NULL}},
  {VK_F6,	{"\033[17~",	"\033[29~",	"\036",		NULL}},
  {VK_F7,	{"\033[18~",	"\033[31~",	NULL,		NULL}},
  {VK_F8,	{"\033[19~",	"\033[32~",	NULL,		NULL}},
  {VK_F9,	{"\033[20~",	"\033[33~",	NULL,		NULL}},
  {VK_F10,	{"\033[21~",	"\033[34~",	NULL,		NULL}},
  {VK_F11,	{"\033[23~",	NULL,		NULL,		NULL}},
  {VK_F12,	{"\033[24~",	NULL,		NULL,		NULL}},
  {VK_NUMPAD5,	{"\033[G",	NULL,		NULL,		NULL}},
  {VK_CLEAR,	{"\033[G",	NULL,		NULL,		NULL}},
  {'6',		{NULL,		NULL,		"\036",		NULL}},
  {0,		{"",		NULL,		NULL,		NULL}}
};

const char *
get_nonascii_key (INPUT_RECORD& input_rec, char *tmp)
{
#define NORMAL  0
#define SHIFT	1
#define CONTROL	2
#define ALT	3
  int modifier_index = NORMAL;

  if (input_rec.Event.KeyEvent.dwControlKeyState & SHIFT_PRESSED)
    modifier_index = SHIFT;
  else if (input_rec.Event.KeyEvent.dwControlKeyState &
		(LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
    modifier_index = CONTROL;
  else if (input_rec.Event.KeyEvent.dwControlKeyState &
		(LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
    modifier_index = ALT;

  for (int i = 0; keytable[i].vk; i++)
    if (input_rec.Event.KeyEvent.wVirtualKeyCode == keytable[i].vk)
      return keytable[i].val[modifier_index];

  if (input_rec.Event.KeyEvent.uChar.AsciiChar)
    {
      tmp[0] = input_rec.Event.KeyEvent.uChar.AsciiChar;
      tmp[1] = '\0';
      return tmp;
    }
  return NULL;
}

void
fhandler_console::init (HANDLE f, DWORD a, mode_t bin)
{
  // this->fhandler_termios::init (f, mode, bin);
  /* Ensure both input and output console handles are open */
  int flags = 0;

  a &= GENERIC_READ | GENERIC_WRITE;
  if (a == GENERIC_READ)
    flags = O_RDONLY;
  if (a == GENERIC_WRITE)
    flags = O_WRONLY;
  if (a == (GENERIC_READ | GENERIC_WRITE))
    flags = O_RDWR;
  open (flags | O_BINARY);
  if (f != INVALID_HANDLE_VALUE)
    CloseHandle (f);	/* Reopened by open */

  tcsetattr (0, &tc->ti);
}

int
fhandler_console::igncr_enabled ()
{
  return tc->ti.c_iflag & IGNCR;
}

void
fhandler_console::set_close_on_exec (bool val)
{
  fhandler_base::set_close_on_exec (val);
  set_no_inheritance (output_handle, val);
}

void __stdcall
set_console_title (char *title)
{
  char buf[257];
  strncpy (buf, title, sizeof (buf) - 1);
  buf[sizeof (buf) - 1] = '\0';
  lock_ttys here (15000);
  SetConsoleTitle (buf);
  debug_printf ("title '%s'", buf);
}

void
fhandler_console::fixup_after_fork_exec (bool execing)
{
  HANDLE h = get_handle ();
  HANDLE oh = get_output_handle ();

  if ((execing && close_on_exec ()) || open (O_NOCTTY | get_flags (), 0))
    cygheap->manage_console_count ("fhandler_console::fixup_after_fork_exec", -1);
  else
    {
      bool sawerr = false;
      if (!get_io_handle ())
	{
	  system_printf ("error opening input console handle for %s after fork/exec, errno %d, %E", get_name (), get_errno ());
	  sawerr = true;
	}
      if (!get_output_handle ())
	{
	  system_printf ("error opening output console handle for %s after fork/exec, errno %d, %E", get_name (), get_errno ());
	  sawerr = true;
	}

      if (!sawerr)
	system_printf ("error opening console after fork/exec, errno %d, %E", get_errno ());
    }

  if (!close_on_exec ())
    {
      CloseHandle (h);
      CloseHandle (oh);
    }
}

bool NO_COPY fhandler_console::invisible_console;

// #define WINSTA_ACCESS (WINSTA_READATTRIBUTES | STANDARD_RIGHTS_READ | STANDARD_RIGHTS_WRITE | WINSTA_CREATEDESKTOP | WINSTA_EXITWINDOWS)
#define WINSTA_ACCESS STANDARD_RIGHTS_READ

bool
fhandler_console::need_invisible ()
{
  BOOL b = false;
  if (GetConsoleCP ())
    invisible_console = false;
  else
    {
      HWINSTA h, horig;
      /* The intent here is to allocate an "invisible" console if we have no
	 controlling tty or to reuse the existing console if we already have
	 a tty.  So, first get the old windows station.  If there is no controlling
	 terminal, create a new windows station and then set it as the current
	 windows station.  The subsequent AllocConsole will then be allocated
	 invisibly.  But, after doing that we have to restore any existing windows
	 station or, strangely, characters will not be displayed in any windows
	 drawn on the current screen.  We only do this if we have changed to
	 a new windows station and if we had an existing windows station previously.
	 We also close the previously opened workstation even though AllocConsole
	 is now "using" it.  This doesn't seem to cause any problems.

	 Things to watch out for if you make changes in this code:

	 - Flashing, black consoles showing up when you start, e.g., ssh in
	   an xterm.
	 - Non-displaying of characters in rxvt or xemacs if you start a
	   process using setsid: bash -lc "setsid rxvt".  */

      h = horig = GetProcessWindowStation ();

      USEROBJECTFLAGS oi;
      DWORD len;
      if (!horig
	  || !GetUserObjectInformationW (horig, UOI_FLAGS, &oi, sizeof (oi), &len)
	  || !(oi.dwFlags & WSF_VISIBLE))
	{
	  b = true;
	  debug_printf ("window station is not visible");
	  invisible_console = true;
	}
      else
	{
	  if (myself->ctty != TTY_CONSOLE)
	    {
	      h = CreateWindowStationW (NULL, 0, WINSTA_ACCESS, NULL);
	      termios_printf ("%p = CreateWindowStation(NULL), %E", h);
	      if (h)
		{
		  b = SetProcessWindowStation (h);
		  termios_printf ("SetProcessWindowStation %d, %E", b);
		}
	    }
	  b = AllocConsole ();	/* will cause flashing if CreateWindowStation
				   failed */
	  debug_printf ("h %p, horig %p, flags %p", h, horig, oi.dwFlags);
	  if (horig && h && h != horig && SetProcessWindowStation (horig))
	    CloseWindowStation (h);
	  termios_printf ("%d = AllocConsole (), %E", b);
	  invisible_console = true;
	}
    }

  debug_printf ("invisible_console %d", invisible_console);
  return b;
}